Abstract
The preferential oxidation of CO in rich hydrogen has been studied for CuO–CeO 2− x catalysts. The catalysts were prepared by co-precipitation with K 2CO 3 + KOH as precipitators and characterized using N 2 physisorption isotherms, high resolution transmission electron microscopy (TEM), and X-ray diffraction (XRD). The results indicate that nano-structured CuO–CeO 2− x catalysts are obtained, and that the ratio of KOH/K 2CO 3 has a beneficial influence on the properties of CuO–CeO 2− x catalysts, i.e., with the addition of KOH, the particle sizes grow smaller, CuO–CeO 2− x catalysts have larger surface areas, CuO species in CuO–CeO 2− x are more easily reduced and achieve higher catalytic performance in the preferential oxidation of CO in rich hydrogen. CO conversion higher than 99% with O 2 selectivity of 100% is obtained for CuO–CeO 2− x catalysts with KOH/K 2CO 3 equal to 4:0 at a temperature of 90–110 °C and a space velocity of 30,000–120,000 ml g −1 h −1.
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